When I was wondering in internet, I found such a funny video about Chinese old style popcorn machine.
It almost disappeared in the Chinese big city like Shanghai, Beijing, but still can be found in many small cities. When I was a boy, the popcorn maker was the most popular guy for kids. Every kids will run to home asap to get the rice, corn and a spoon of sugar, take them to the popcorn maker and wait there for the yummy snacks.
By the way, there is always a big strong bag connecting to the machine. all the hot popcorns will spray into the bag. it looks old and crude, but actually very safe, I never heard any accidents of this machine.
Note: I don’t have this old machine, haha ,but I have new style popcorn machine for rent, just like what you know in theater.